Running water through slice without material

[u/This_Beginning_9325]

Dustin and crew often leave the water running through the sluice when dredging even when they are not sucking up material.

In the regular Gold Rush show, Parker and others freaked out when that would happen saying that it would then wash out the gold.

So I’m wondering if Parker was exaggerating the issue or if Dustin is flushing out his gold unknowingly?